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Claim and Claim Adjustment Expense Reserves - Excess Workers' Compensation LPT (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 05, 2021
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Reinsurance recoverable   $ 6,381 $ 6,051    
Increase (decrease) in provision for insured events of prior years   189 $ 42 $ 48  
Outstanding reserves maintained as security for obligations   247      
CNA | Loss Portfolio Transfer for Workers' Compensation Liabilities          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Reinsurance recoverable   615     $ 690
Payment for reinsurance premium $ 697        
Increase (decrease) in provision for insured events of prior years   $ (75)      
CNA | Loss Portfolio Transfer for Workers' Compensation Liabilities | Maximum          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Reinsurance recoverable         $ 1,000